Tag: physics

Questions Related to physics

If the amplitude of a wave is doubled, what will be the effect on its loudness ?

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. increase four times

  2. increase two times

  3. decrease four times

  4. decrease two times

Show answer
Correct Option: A
Explanation:

Loudness depends on the square of the amplitude of the wave. 


That is, $loudness\propto { \left( amplitude \right)  }^{ 2 }$

Thus, when amplitude of the wave is doubled, the loudness becomes four times.

Which of the following factors change when a sound gets louder?

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. intensity

  2. Speed of the sound wves

  3. frequency

  4. decibel level

  5. wavelength

  6. amplitude

Show answer
Correct Option: A,D,F
Explanation:

When a sound gets louder , its amplitude increases , as intensity $I\propto A^{2}$ (amplitude) , therefore intensity of sound also increases , which in turn increases level of intensity i.e. decibel .

With the increase in frequency a sound becomes louder. True or false

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Increased frequency means decreased wavelength and higher pitch/ sharpness. So increase in frequency makes sound more sharper while higher amplitude or higher intensity makes louder sound. 

The characteristic of sound which distinguishes a feeble sound from a loud sound of the same frequency is -

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. loudness

  2. pitch

  3. music

  4. noise

Show answer
Correct Option: A
Explanation:
Loudness is the characteristic of sound which distinguishes feeble voice from loud voice.

A vibrating tuning fork is first held in the hand and then its end is brought in contact with a table. Which of the following statement(s) is/are correct in respect of this situation?

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. The sound is louder when the tuning fork is held in hand.

  2. The sound is louder when the tuning fork is in contact with table.

  3. The sound dies away sooner when tuning fork is brought in contact with the table.

  4. The sound remains for a longer duration when turning fork is held in hand.

Show answer
Correct Option: B,C,D
Explanation:

when the tuning fork is held in hand there is only air in contact to the fork and sound waves force the air particles to vibrate but when the fork is in contact with the table the sound waves will travel in table as well as air which is in contact with table top. The sound dies sooner as the waves travel much faster in solids and liquids than in gases.

The difference of sound level between two point is $30$ decibel. The ratio of pressure amplitude between points is : 

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. $10$

  2. $20$

  3. $30$

  4. $32$

Show answer
Correct Option: D

The pitch of the sound produced by a stretched string gets higher as the tension .....................

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. Increases

  2. decrease

  3. same

  4. none of these

Show answer
Correct Option: A
Explanation:

Pitch depends on string length and string tension.

  1. If the string's mass per unit length remains constant, for longer string, high tension will produce high pitch.
  2. If the string's length remains constant, for heavier string, the higher the tension will generate higher pitch.

The pitch of sound increases if its frequency

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. increases

  2. decreases

  3. remains same

  4. cant say

Show answer
Correct Option: A
Explanation:

The pitch of sound increases if its frequency increases. 
Pitch describes how high or low a tone is and depends upon the rapidity with which a sounding body vibrates, i.e., upon the frequency of vibration. The higher the frequency of vibration, the higher the pitch.

Sound wave P has a greater amplitude and a larger wavelength in air than sound wave Q. How do the loudness and pitch of P compare with the loudness and pitch of Q?
How do the loudness and pitch of P compare with the loudness and pitch of Q?

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. P is louder and higher in pitch than Q

  2. P is louder and lower in pitch than Q

  3. P is quieter and higher in pitch than Q

  4. P is quieter and lower in pitch than Q

Show answer
Correct Option: B
Explanation:
We know that pitch $\propto$ frequency.
wavelength of P $>$  wavelength of Q
$\implies$ frequency of P $<$ frequency of Q
$\implies $ pitch of P $<$  pitch of Q
now ,
loudness $\propto $ amplitude
So, P has more loudness as compared to Q.

Which figure indicates low pitch?

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

In figure B , wavelength (distance between two successive compressions or rarefactions ) is large therefore frequency will be smaller i.e. pitch is low .